You're too late.
Here is a list of 155 of them Lists: 133 t-shirt blogs + 27 new additions = 160 t-shirt blogsbyHIDE YOUR ARMS
I think that list is a great starting point (it's also been posted here if you search for blogsThank you! I couldn't find one. Regardless, there are some that just are not on there (some are!). I think it would be great to expand on that list...
http://hideyourarms.com
With the 160 (plus more in the comments) of hideyourarms, how much more do you needDo you have links to sites another than hideyourarms with lists that are updated? I couldn't find any.